In counties governed as to juries by the laws providing for interchangeable juries, the names of the jurors shall be placed upon the general panel in the order in which they are drawn from the wheel, and jurors shall be assigned for service from the top thereof, in the order in which they shall be needed, and jurors returned to the general panel after service in any of such courts shall be enrolled at the bottom of the list in the order of their respective return; provided, however, that the trial judge upon the demand of any party to any case reached for trial by jury, or of the attorney for any such party, shall cause the names of all the members of the general panel available for service as jurors in such case to be placed in a receptacle and well shaken, and said trial judge shall draw therefrom the names of a sufficient number of jurors from which a jury may be selected to try such cause, and such names shall be transcribed in the order drawn on the jury list from which the jury is to be selected to try such case.